<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<div id="app">
			<!-- 属性说明:
			 1.number 将用户输入变为数值类型
			 2.trim 去掉开头和结尾的空格
			 3. lazy 将input事件改为change事件(懒加载),当鼠标离焦时生效
			 -->
			 <input  name="age" v-model.number="age" />
			<button @click="add">增加10倍</button><br />
			<input  name="name" v-model.trim="name" />
			获取name属性长度{{name.length}}<br>
			<input  name="username" v-model.lazy="username" />
			观察响应现象{{username}}
		</div>
		<script src="https://cdn.jsdelivr.net/npm/vue@2"></script>
		<script type="text/javascript">
			const app = new Vue({
				el: '#app',
				data: {
					age: '',
					name: '',
					username: ''
				},
				methods: {
					add(){
						this.age=10+this.age
					}
				}
			})
		</script>
	</body>
</html>
